Design problem in training puzzle

When failed the puzzle, the wrong king get marked as get checked.
video for better understand:
www.youtube.com/watch?v=ZB9ngEMILOs
g8 checked but when "give up" g1 marked

My browsers cache is disabled, so that cant be responsible for porblems

According to your video, your mouse was over the «Give-up», so you must have pressed it by accident.
The problem worked out fine for me.
http://fr.lichess.org/training/39341
Future solution: Do not put your mouse over the «give-up», unless you want to give-up.

Don't look stupid do you think I am.... Mabe u are that...
It was a reproduction of the problem, at first it happened at a wrong move.
Just for u:http://youtu.be/4FzgJT3dBkc